From ab3449349fe15d52e5c6eb6107a1ed21487eb1ed Mon Sep 17 00:00:00 2001
From: Christopher Jolly <chris-jolly_au@hotmail.com>
Date: Sun, 8 Oct 2023 01:30:58 +0800
Subject: [PATCH] No need to wrap an expression in a CaseExpression (generating
 IIF...) if the expression we are meant to be checking is a non-null constant
 expression

---
 src/EFCore.Jet/Query/Sql/Internal/JetQuerySqlGenerator.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/EFCore.Jet/Query/Sql/Internal/JetQuerySqlGenerator.cs b/src/EFCore.Jet/Query/Sql/Internal/JetQuerySqlGenerator.cs
index eab76ac..90feaf7 100644
--- a/src/EFCore.Jet/Query/Sql/Internal/JetQuerySqlGenerator.cs
+++ b/src/EFCore.Jet/Query/Sql/Internal/JetQuerySqlGenerator.cs
@@ -586,6 +586,10 @@ namespace EntityFrameworkCore.Jet.Query.Sql.Internal
                 {
                     Visit(notnullsqlexp);
                 }
+                else if (checksqlexp is SqlConstantExpression { Value: not null })
+                {
+                    Visit(notnullsqlexp);
+                }
                 else
                 {
                     Visit(caseexp);